Impact-fuse.



K. WIESER.

IMPACT FUSE.

APPLICATION FILED AUG. 28, 1907.

Patented Feb. 9, 1909.

1 1 flaw.

A A i UNITED STATES PATENT oEEioE.

KARL WIESER, OF BREDENEY, GERMANY, ASSIGNOR TO FRIED. K RUPP AKTIEN- GESELLSOHAFT, OF ESSEN- ON- THE-RUHR, GERMANY.

IMPACT-FUSE.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Application filed August 28, 1907. Serial No. 390,482.

To all whom it may concern:

Be it known that I, KARL WIEsER, a subject of the Emperor of Germany, and a resident of Bredeney, Prussia, Germany, have invented certain new and useful Improve-f ments in Impact-Fuses, of which the following is a specification.

The present invention relates to impact fuses having a delay action means capable of being shifted to and from efi'ective posi-- tion and the object of the invention is to, do away with the so-called delay-charges. These powder charges have the drawback that they become destroyed by the pressure caused by the explosion of the primer and, therefore, burn instantaneously, that is to say, they do not cause any delay of the ignition, and this is in particular the case when the charges are made small for the.purpose of obtaining a short delay.

The accompanying drawings show two embodiments of the invention applied to a base fuse, by the way of example. Figure 1 is an axial longitudinal section through one embodiment; Fig. 2 is a bottom view of the same; Fig. 3 is a section on line 3-3, Fig. 1, looking from above; .Fig. -.l shows a part of the secondembodiment in a view corresponding to that shown in Fig. 1, and Fig. '5 is a section on line 5-5, Fig. 4, looking from above:

Reference will first be had to the embodiment shown in Figs. 1 to 3. The bolt 13 carrying the primer A, the safety spring C and the firing pin D are arranged in abushing E which is rotatably but non-slidably mounted in the fuse housing Thebushing E can beadjusted by means of a screw plug G which closes the bushing towards the exterior and which has its head provided with a slot g for the engagement of a suitable key.. The inner end of the bushing is provided with a bore 6' which is eccentric to the axis of rotation of the bushing and in which is located a powder charge H adapt ed to increase the igniting-flame. Above the bushing E an insertion-piece K is arranged in the housing F and is held against rotation. The insertion piece Kis provided with two separate channels L M which serve to conduct the igniting flame of the primer to .a powder charge P which is adapted to ignite .a detonator (not shown) arrangedbetween the bursting charge of the projectile and the fuse. The mouths of the channels L M adjacent to the bushing E are the same distance from the axis of rotation of the bushing E as the bore a. The bore 6 can,fltherefore, by turning the bushing E, be adjusted in such a manner that either the channel L or the channel M serves as connection'between the powder charge P and the ignition chamber of the impact fuse.- The channel M is considerably longer than the channel L; it leads at an inclination upwardly from the bushing E, extends then to the outer surface of the fuse, (see Fig. 3) in i a plane at right angles to the longitudinal axis of the fuse, thence in the same plane to its end'portion which is also inclined upwardly and terminates'opposite to the powder charge P. The igniting flame therefore,

consumes longer time in traversing the path formed by the channel M than in pass ng through the channel L. This difl 'erence in time is partly caused by the fact thatthe fire-jet in traversing the channel M is obliged to change its dlrection at three places by reason of the above-described shape of the channel M. In the channel M are preferably arranged small perforated powder bodies m m of such a nature that they can burn or explode instantaneously. These powder-bodies are merely for .the purpose of increasing the igniting flame from the primer or kindle the fire-jet afresh. The remaining part of the channel M is empty as is also the channel L. Between the insertionpiece K and the upper end of the bushing E is located a packing disk N'of cloth or the like which is secured on the bushing E and has a bore e.

In the drawing, the'bushing E is in the position in which its bore e communicates with the short channel L. When, on the imperforation a registering with the pact of the projectile, the firing pin D hits the primer A, the igniting flame will conse-- .quently pass without delay to the powder charge P through the bore 6' 'andthe chan nel L, and the projectile will therefore burst at the moment of impact. If, however, theignition is to take place with delay, the bushing is, by means of the screw-plug G, turned to that position in which the bore 6 registers with the channel M. With this adjustment of the fuse, a certain time elapses between the momentof impact and the ignition of the powder charge P. The correct adjustment of the bushing is indicated by the marks Q, R S which are arranged on the head of the screw-plug G and on the bottom of the fuse housingF.

It is evident that several channels of different length could be provided in the insertion-piece K for the purpose of obtaining delays of different duration.

If the primer is of sufficient force or the powder charge P is sufficiently sensitive the strengthening charges m m? may be done awa with.

In the embodiment shown in Figs. l and 5 a channel T is cut in that wall of the in sertion-piece K that is towards the bushing E. The channel T extends in a broken line, and has arranged therein a strengthening charge t. The channel is not endless; both its ends t t and a point t intermediate of the ends have the, same distance from the axis of rotation ofithe bushing E as the bore 6. The end t of the channel T communicates with the powder charge P through the medium of abore V in the insertion-piece K. When the bore 6 of the bushing E registers with the end P of the channel T the igniting flame of the primer passes without delay through the bore V to the powder charge. When the bore e is adjusted to the joint t or to'the end 25 of the channel T delays of difl'erent duration take place in the ignition.

Having thus described the invention, what is claimed and desired to secure by Letters Patent is:

1. An impact fuse having an open channel for the igniting flame, said channel being circuitous in its course whereby it causes the igniting flame to change its direction and effects delay in the transmission of the igniting flame without the interposition of retarding combustible material. y

2. An impact fuse having an open chanl nel for the igniting flame, said channel being circuitous in its course whereby it causes the igniting flame to change its direction and effects delay in the transmission of the ignittransmission of the igniting flame are ignited byand reinforce the same.

3. An impact fuse having a direct action open channel and an open channel for the.

igniting flame,.said last namedchannel being circuitous 1n its-course .whereby it causes the igniting flame to change its direction and effects delay in the transmission of the igniting flame without the interposition of retarding combustible material, and means for introducing either of said channels in the conducting position at will.

l. An impact fuse having a direct action open channel and an open channel for the igniting flame, said last named channel being circuitous in its course whereby it causes the igniting flame to change its direction and eflectsdelay in the transmission of the igniting flame Without the interposition of retarding combustible material, said circuitous channel being provided with perforated powder charges which while permitting immediate transmission of the igniting flame are ignited by and reinforce the same, and means for introducing either of said channels in the conducting position at will.

The foregoing specification signed at DusseldoriflGermany, this 12th day of August,

KARL WIESER.

In presence 'of ALFRED POHLMEYER, M. ENGELs. 

